Youtubers that don't have an email address contact on their YouTube channel. But they do have either Twitch, Discord or X pages/accounts.
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https://www.youtube.com/@DireRaven
https://www.youtube.com/@ItsReallyPoofy
https://www.youtube.com/@yuezeko
https://www.youtube.com/@maria_atalla
https://www.youtube.com/@grandon8944
https://www.youtube.com/@getmeowlax4768
https://www.youtube.com/@Kittet3
https://www.youtube.com/@DolphinTreasureArt
https://www.youtube.com/@purple-edgehttps://www.youtube.com/@CloudJumper01
https://www.youtube.com/@telesticgamer8251
https://www.youtube.com/@retrogamingdino
https://www.youtube.com/@Gamesalott/videos
https://www.youtube.com/@kiddichigo/videos
https://www.youtube.com/@radioparalax-sendemitschnitte
https://www.youtube.com/watch?v=-sqc75cxoJ0
https://www.youtube.com/@diziouf/videos
https://www.youtube.com/@nicegeargames/videos
https://www.youtube.com/@marcgoesblindgaming2076
https://www.youtube.com/@lastheroesgameplays/videos
https://www.youtube.com/@PatienceHere
https://www.youtube.com/@daexpii/videos
https://www.youtube.com/@rafgamer4080/videos
https://www.youtube.com/@radioparalax-sendemitschnitte/videos
https://www.youtube.com/@bandaloo7776/videos
https://www.youtube.com/@nattyboy1745/videos
https://www.youtube.com/@AGamingHead/videos
https://www.youtube.com/@palaros/videos
https://www.youtube.com/@ThrowingStarsofDavid/videos
https://www.youtube.com/@stavovich/videos
https://www.youtube.com/@aramaki_aramakigames/videos
https://www.youtube.com/@GameplayDepotYT/videos
https://www.youtube.com/@thegamingpup22/videos
https://www.youtube.com/@ezezgame/videos
https://www.youtube.com/@indiehorror/videos
https://www.youtube.com/@bakanik/videos
https://www.youtube.com/@dragankill/videos
https://www.youtube.com/@FellowPlayer/videos
https://www.youtube.com/@nicolacristi/videos
https://www.youtube.com/@tyvennagaming1474/videos
https://www.youtube.com/@Flopamine/videos
https://www.youtube.com/@joncrift3274/videos
https://www.youtube.com/@Seeric_io
https://www.youtube.com/iwanPlays
As for YouTubers who specialise in horror games, just pick any horror game on here and scroll to the comments. YouTube is saturated with YouTubers chasing the reaction video train. There are probably some already on this list and there is no shortage. They're easy to find. They usually go and find you if you're a horror game developer to be honest. However, they tend to be exclusive in horror content or else expand into AAA mainstream releases if not.
In general, some additional advice we would give in terms of finding your niche is to really think about what the strongest aspect of your game is or what aspect of your game you really value. Think about what aspect of your game, players will identify. As in, if they were only allowed to use one adjective to wholly describe your game, what would it be. Then once you've done that, utilise Itch's browse feature and search games using the word you've identified as your main tag. For example, for one of our games we searched the tag 'political'. We browsed a few games that popped up with that tag. We looked at the comments for those games and occasionally found YouTubers who had made a video for those games where they then posted it. That was a Youtuber more likely affiliated with the content we would make. Try different tags. We tried 'philosophical' once and 'shoot em up' for another. It is slow, gradual but slightly more accurate hunting if you need to find a content creator for an ambiguous niche.
Will do more with other websites after we've plunged into all that more deeply. And after getting Twitch and Discord going maybe.
If you find this post valuable and want to pay some form of gratitude, please take a look at the free games on my page and download the ones you like the look of. And if you try Killing Machine Movement and believe games can grow on you after the initial first impression, please try to get to level 4 and see what you think from there.
How to grow YouTuber's audiences? That's another question to then tackle.
Add to this database in the meantime maybe? *shrugging emoji*